Stove



Dec. 20, 1927.

A. AHLBERG S TOVE Filed Sept. 8, 1925 A TTOI VE Y.

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Patented Dec. 20, 1927.

UNITED STATES 1.553.532. PAI'ILENT OFFICE.

ALFRED Marianne. or INDIANAPOLIS; INDIANA.

Application filed September 8, 1925. Serial No. 54,891. i

It is the object of my invention to produce a stove or furnace which will be particularly' effective in heating the air'passing throughit. A further object'of my inven; tion is to equip my stove'or' furnace with a coal hopperfrom which coal may be fed by gravity onto the grate.

l accomplish the 'above objects by forming my stove or furnace with an inner and outer shell, and I provide within theinner shell a firecompartment within which the fuel is burned and which communicates with the space between the two shells so that the hot gases arising from the fire will pass be.-

tween the shells, and I provide for the ad mission of the air to beheated into the inner shell on both sides of the fire compartment.

The accompanying drawing illustrates my invention: Fig. 1 is a plan view of my furnace; Fig. 2 is a vertical central section on the line 22 of Fig. 1; Fig. 3 is a horizontal sectionon the line 3-3 of 2; Fig. lis a horizontal section on the line .H of Fig. 5; Fig. 5 .is a vertical section on the line 5 5 of Fig. 3 with part of the inner shell broken away to illustrate the arrangement of the parts and Fig. dis a fragment-a1 section on the line 66. of; Fig. 2. y

My furnace comprises an outer shell 10 and an inner shell 11, both shells being pref erably circular in cross section and concentric and conveniently being formed of sheet metal. Located within the inner shell 11 but separated therefrom by a hood 12 is the fire compartment 13. The'inner shell 11 extends downward on both sides of the fire compartment '13, the two downwardly extending portions of such shell being open at the bottom as is evident from Fig. 5.

Attached to the shell 10 as by a suitable bracket 15, I provide a vertically extending fuel hopper 16, which at its lower end curves inwardly and passes through the outer shell 10. The hopper 16 may conveniently be provided'with a pivoted lid or cover 17. Pivotally attached to the lower end of the hopper 16 within the shell 10 is a grate 18 which extends inwardly into the fire compartment 13, the inner end of the grate 18 being supported by ashaker bar 19 which extends through the fire compartment passes through the outer shell .10. The shaker bar 19 where it passes through the shell 10 may conveniently be provided on its lower edge with a series of notches which and engage the shell 10 and by which the angular position of the grate 18 may be varied. If desired water pipes 20 may be located'within the fire compartment 13 in order toprovide for the heating of'water.

Slidably mounted in the lower part of the fire compartment 13 below the grate 18 is an ash drawerinto which'ashes fall from the grate 18. The drawer 25 may be readilyv withdrawn forthe'purpose of emptying the ashes which accumulate therein. The front 26 of the drawer 25 extends upward to cover a draft opening 27in the shell 10, By regulating the position of the drawer 25, the amount of air passing through the fire may be controlled 1 Near-the top of the shell l l 1 provide a spider 30 having a plurality of hollow arms 31 communlcating with the space between the inner and outer shell.- Located-between the inner and outer shell isa downwardly extending conduit 32 into theupper end of which there opens one ormore of the arms 31 as is clear from Fig 3. The lower end of the conduit 32 communicates with a pipe 33 through which theburned gases may be conducted to a chlmney or stack;

The stove. is provided with a cap 35 which closes the space between the inner and outer shells. .Over the inner shell 11the cap 35 may, be provided with a plurality of pipes 36 through which the heated air may be conducted to any desired locations. If such pipes 36 are not provided, the cap 35 is provided with a suitable outlet opening for the heated air which passes upward through the inner shell 11.

The hot gases which arise from the fire on the grate 18 pass into the top of the fire compartment 13 to heat the water pipes 20, x

if such water pipes are provided. From the compartment 13 the hot gases escape into the space between the inner and outer shells and. following the course indicated by the long arrowsin the drawing, pass upward between the shells, into the hollow arms 31 of the spider 30, and thence through the downwardly extending conduit 32 to the pipe 33. The air to be heated enters the lower portion of the shell 11 as indicated by the shorter arrows in the drawing and follows a generally upward course through such shell. In its passage through the shell the air is exposed to a large area of metal which is heated by the hot gases arising 1. A stove or furnace, con'iprising an i11 ner and an outer shell, a fire compartment located within said inner shell and CODllTlll-l'licatlng 'wlth. the annularspace between said two shells, a grate located in said fire compartment, a coal-hopper from which coal may be fed by gravity onto said grate, and. means forvarying the angular position of said grate to control therate at which fuel is fed from said hopper.

2. A stove or furnace, comprising a hollow cylindrical outer shell, an inner cylindrical shell located within said outer shell and of smaller diameter than said outer shell to provide an annular space, a closure for the upper end of said annular space, a fire compartment, located within said inner shell and communicating with the annular space between said shells so that the hot combustion gases will pass upward through such annular space, said inner shell extending downward below said fire compartment and having admission openings on opposite sides thereof, said fire compartment having a height considerably less than that of said shells in order that the air flowing upward ly through said inner shell may occupy the space within said shell and over said fire compartment, a hollow-armed spider located within said inner shell near the top thereof, some of the arms of said spider communicating with the annular space between the inner and outer shells, a downwardly extending conduit located between'said shells, one or more of the arms of said spider communieating with'said conduit, and a pipe for conducting the combustion gases from said conduit, the point of communication between said conduit and pipebeing lower than said spider; V

A stove or furnace, comprising a hollow cylindrical outer shell, an inner cylindrical shell located, within said outer shell and of smaller diameter than said outer shell to provide'an annular'space, aclosure for the upper end of said annular space, a'fire compartment located within said inner shell and communicating with the annular space between said shells so that the hot combustion gases will pass upward through such annular space, said inner shell extending downward below said fire compartmentand having admission openings on opposite sides thereof, said fire compartment having a height considerably less thanthat of said shells in order that the air flowing upwardly through said inner shell may occupy the space withinsaid shell and over said fire compartment, a hollow-armed spider located within said innershell near the top thereof, some of the arms of said spider communicating with the annular space between the inner and outer shells, a downwardly extending conduit, one or more of the arms of said spider communicating-with said conduit, and a pipe for conducting the combustion gases from said conduit, the point of communication between said conduit and'pipe being lower than said spider.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 31st day. of August, A. D. one thousand nine hundred and twenty-five.

ALFRED AHLBERG. 

